A couple of pointers on faceted search

The primary Open Source option at this point is Apache’s Solr which grew on top of Lucene

• The Solr homepage - http://www.solr.org

• The official Solr tutorial

• Another tutorial with step by step instructions at SynapticLoop

One of the commercial option out there is Endeca’s MDEX:

• http://www.endeca.com

Other pointers of interest:

• MIT SIMILE Faceted Browser page

• The SIMILE Exhibit project page